History: Difficult

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Across
  1. 2. West African slaver Kingdom
  2. 6. First European settlement in North America
  3. 8. Antebellum vigilante
  4. 10. Ancient Sumerian City
  5. 11. Naval skirmish between Iran and America
  6. 13. The Five Families
  7. 14. Christian invasion of the Baltics
  8. 16. Subject of the trial of the century
  9. 18. 1970's Vice President
  10. 21. The Gentleman Pirate
  11. 24. Tuscan poet
  12. 25. Last ruling dynasty of Iran
  13. 26. Namesake of a Latin American nation
  14. 29. Home of the Knights Hospitaller
  15. 30. 1940's Appalachian Subgenre of Country music
  16. 31. Presumed eaten by crabs
Down
  1. 1. Defeated in the Nullification Crisis
  2. 3. Soviet female pilots
  3. 4. Vandal King who vandalized Rome
  4. 5. Longest reign in Mexican history
  5. 7. Emperor of America
  6. 9. Home of Lonesome George
  7. 12. Grandfather of the Biblical Noah
  8. 15. 1967 Levantine conflict
  9. 17. Blinder of the Cyclops
  10. 19. Purged in the Albigensian Crusade
  11. 20. Capital of Roman Britain
  12. 22. Region sacked by William the Conqueror
  13. 23. Successors of Alexander the Great
  14. 27. Saharan trade node
  15. 28. Birthname of a famous Borjigin clansman